Preparation of tetra-carboxylic di-anhydrides



Patented Sept. 21, 1943 UNITED sTATEs OFFICE;

PREPARATION DI-ANHYDRIDES 1 Lewis W. Butts,v Bcltsyille, Md assig'nor to Claude R. Wickard, as Secretary of Agricultu'reotthe United States of America and to his successors in office No Drawing.

Application October 23, 1940, Serial No. 362;420;:%

7 claims. (01.2.605

( Granted under the act (pf- March amended April 30, 1928;;3704) This application is made under the act of March 3, 1883, as amended by the act of-April 30, 1928, and the invention herein described and" claimed, if patented, may be: manufactured and used by-orffor'the Government of the United States of America for governmental purposes without the payment tomeof any royalty thereon ganic. compounds, such as non-benzenoid, steroids, and to processesoj, preparing, them.

This invention is based on the discovery that organic compounds belonging to the class of 1,5-diene-3'-ynes, i. e. compounds containing the atomic grouping I 1 c=o -oao- =o I i i react with two males of maleic anhydride toiiorm, stable. addition products which contain two carbcn rings more than are contained in the diene-y-ne employed. The 'molecular weight of these productsis equal to the sum of the molecu'- lar weightoflthe dieneyne employed and twice the molecular weight of maleic anhydride.

The present invention relates to polycyclic or-.

the dien-e-yne, cyclohexenylcyclopentenyl' acetylene V CfllE-ClEh-(Ffh o cm reacts readily with maleic anhydride. this terialsoi will react with; one molecule of compounds con taining;,a ,=system-;of conjugated carbonto carbon doublebonds to giye addition products. My-process; differs from that. of- Diels and Alder in two respects; (;1) ;,'IW.o molecules of maleic' anhydride areadded to one molecule of the other reactant; 2. lzieto herwreactant is a,- ,.5-dien,e-'3:-ynet This type doesvnotwcontain a system of conJ' gated carbon to carbon double bonds.

:1 The discovery-of-"Dane and co-workers- (Annalen'der *Chemie," 532; 39-,-151 (1937) and 536',

1837-196-a(1 938))" should" also be noted. They found that one molecule of compounds containing the. atomic grouping -'-C=C CECH' could be addedrcto one molecule of maleic anhydrid'e I (or"othericompound containing the grouping ll. -c=o-o or i I Q-:,-Q.,C-,

It eyidentthat the reaction also-diners :immmre oe sna i 'lher'e isgone; -,nlore pertinent recorded discover Blomquist and Marvel (J. .Am. Chem.

'sgc..55 ,,'1 655aie62, 1933) Observed that approximately two molecules of maleic anhydride, could be added to one molecule of a 1,5-diene-3-yne. flhcir products however, were amorphous maetermined structure.

*A'll known I rocesses for: thetsynthesis of steroids r'elate to the preparation of benzenoid steroids., l3u t, the majority of the, naturally occurring steroi d s among them the therapeutically important male hormonesadrenocortic'al' hor- .mcne s and,. progesterone-are non-benzenoid, My p'iocess makes availablaior the first time,

have previously 5 found that one molecule ofmalei-cfanhydride (and manyother compounds containing'ithe atomic grouping by synthesis, steroids oilthe non-benzenoidtype, .as well; aspen-steroid types of polycycliccompounds, whichare useful as. intermediates in the 'synthsis 'of therapeutic compounds. 7 My inventionfmay be practiced by any of the procedures illustrated in the following examples. While I cite the use of a sealed glass tube, it is to be understoodv that I may use any type of container that will permitthe development of pressure during heating and that will exclude the presence of atmospheric oxygen. I may use also, under certain conditions, any open type vessel.

EXAMPLE 1.-----1,5-dimethyl,-2,3,4,6,7,8-hewahydronaphthaZene-3,4,7,8-'tetracarbomyZic-3,4; 7,8-didee One molecular proportion of 2,5-dimethy-l-1, 5-hexadiene3ayne' ('diisopropenylacetylene) is mixed with two molecular proportions of maleic anhydride and the mixture is, heated, suitably in a sealed glass tube, at 130 C. for 1-5 hours.

On cooling, with or without the addition of a solvent, such as acetone, ethyl acetate, or benzene, the product:

separates in high yield as colorless crystals. The melting point of the pure compound lies about 262-263 C. It has the empiric composition C16Hl406. When heated with water it gradually dissolves to give an acid solution., When heated with ethanol it gives a tetraethyl ester, C24H3408. When heated with palladium and charcoal it gives, among other products, 1,5-dimethylnaphthalene. Observation of the absorptionspectrum indicates that the two double bonds are at the positions shown in the structural formula.

EXAMPLE 2.8 (14), 9-steradiene-6,7,11 ,1 Z-tetra- 'carboryZz'c-fi] 1 1 ,1 Z-dianhydride One molecular proportion of cyclohexenylcyclopentenylacetylene is mixed with two molecular proportions of maleic anhydride'and heated as described in Example 1. The product which is isolated in the same manner as in Example 1 after purification melts at about 249-251? C. When heated with palladium and charcoal it yields, among other products,

15,1G-dihydro-lT-cyclopenta m phenanthrene The carbon skeleton is thus demonstrated to be that found in the natural steroids. The empiric composition is C21H2006. The absorption spectrum is similar to that observed for the product described in Example 1. The probable structure of this product is therefore that shown by the structural formula set forth in the introductory part of these teachings.

EXAMPLE 3.-1,2,3,4,5,6,6a,7,8,9,10,11,12,1Za-tet'radecahydrochrysene 5,6,11,12 tetracarborcylz'c- 5,6; 11,12-clz'anhydride A preferable name for this product, though one notyet sanctioned by usage, employs the numbering in use with steroids, viz., 8(14) ,9-chrysita- Eliene-fifl ,11,12-tetracarboxylic-6,7;' 11,12-dianhyride.

One molecular proportion of dicyclohexenylacetylene and two molecular proportions of maleic anhydride were heated together and the product isolated as in the previous examples. The product melts at 254-256 C., and has the empiric composition C22H22O6. It has substantially the structure:

Having thus described my invention, what I claim for Letters Patent is:

1. The 1,5 dimethylhexahydronaphthaleneture:

coo-co CH---CHCHCH:CH: cnronro==c 0:0- 0H, (EH2-CH2CH CHCH o-oco i and consisting of colorless crystals having a melting point of substantially 250 C.

3. The tetradecahydrochrysene-5,6,11,12-tetracarboxylic-5,6;11,12-dianhydride having substantially the structure: 1

CH--CHCH-CHT"CH2 cHrcHr-c l C=-CHr-CH: (BHr-CHz- H-CH-H and consisting of colorless crystals having a melting point of substantially 255 C.

4. The process of manufacturing a nonbenzenoid fused polycyclic compound chosen from the group consisting of 1,5-dimethy1- 2,3,4,6,7,8 hexahydronaphthalene-3,4,7,8 tetracarboxylic-3,4; 7,8-dianhydride 8(14), 9-steradiene-6,7,11,12-tetracarboxylic-6,7; 11,12 dianhydride; 1,2,3,4,5,6,6a,'7,8,9,10,11,12,12a-tetradecahydrochrysene 5,6,11,12-tetracarboxylic-5,6; 11, 12-dianhydride,from the corresponding dieneyene chosen from the group consisting of diisopropenylacetylene, cyclohexenylcyclopentenylacetylene, dicyclohexenylacetylene, respectively, comprising heating the dieneyene in a closed vessel with maleic anhydride, in the absence of any solvent, at a temperature of about C. until the compound is formed, and thence recovering said compound.

5. The process of manufacturing the compound 1,5 dimethyl-2,3,4,6,'7,8-hexahydronaphthalene-3,4,7,8-tetracarboxylic-3,4; 7,8 dianhydride, comprising heating in a closed vessel diisopropenylacetylene with maleic anhydride, in the absence of any solvent, at a temperature of about 130 C. until the compound is formed, and thence recovering said compound.

6. The process of manufacturing the compound 8 (14), 9-steradiene-6,7,l1,12-tetracarboxylic-6,7; 11,12-dianhydride, comprising heating in a closed vessel cyclohexenylcyclopentenylacetylene with maleic anhydride, in the absence of any solvent, at; a temperature of about 130 C, until thecompound is formed, and thence recovering said Y compound.

7 The process of manufacturing the compound 1,2,3,4,5,6,6a,7,8,9,10,11,12,12a tetradecahydrochrysene-5,6,11,12,-tetracarboxylic-5,6; 11,12-dianhydride, comprising heating in aclosed vessel dicyclohexenylacetylene with maleic anhydride, in the absence of any solvent, at a temperature of about 130 C. until the compound is formed, and thence recovering said compound.

'LEWIS W. BUTZ. 

